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Finding the Fourth Proportional to 3,907.96, 5,392.99 and 2,139.57

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Solution

The fourth proportional to 3,907.96, 5,392.99 and 2,139.57 is: 2,952.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.96 : 5,392.99 = 2,139.57 : x
  2. Step 2: Convert to fraction form
    3,907.96/5,392.99 = 2,139.57/x
  3. Step 3: Cross multiply
    3,907.96x = 5,392.99 × 2,139.57
  4. Step 4: Simplify right side
    3,907.96x = 11,538,679.61
  5. Step 5: Solve for x
    x = 11,538,679.61/3,907.96
  6. Step 6: Final answer
    x = 2,952.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.